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The task requires you to do it in 2500 ticks or less.
You likely did it in 2501 which gets rounded down to 25:00 when output into the chatbox.
Does every number get rounded down here, or would a tick time equating to say 45.6 get rounded up to 46 in the chat line?
I don't actually know off the top of my head when it comes to the times it puts into the chat box but it would surely have to round somewhere since it's smallest unit is 1s whereas a cycle is 0.6s
I'd imagine that it does round down since runescript tends to round down in calculations by default